why pendrive properties shows 14.5GB insted of 16GB

In the above picture, the pen drive is 16GB but it show only 14.5GB.

Actually,

1GB=1024MB

But flash dive companies multiply the MB by 1000 instead of 1024.

1MB=1000bytes

1GB=1000000bytes 

i.e.16GB=16000000bytes( Actually 16GB= 16777216bytes)

So, 16GB =14.5GB (Multiplyed by 1000) which should be multiplyed by 1024.